Fuel burner



T. E. \NOOD FUEL BURNER Oct. 11, 1938.

Filed May 9, 1956 R O T N E V m ATTORNEY.

Patented Oct. 11, 1938 UNITED STATES PATENT OFFICE FUEL BURNER Thomas E. Wood, Library, Pa. Application May 9, 1936; Serial No. 78,837 10 Claims. (01. 1581l0) This invention relates to gaseous fuel burners of the type adapted to selectively develop desirable flame characteristics, and it is among the objects thereof to provide a burner which shall I; be provided with means for regulating the application of the air supply to achieve both a proper premix' character of flame and permit control of the flame characteristic as to luminosity and length.

' These and other objects of the invention will become more apparent from a consideration of the accompanying drawing constituting a part hereof in which like reference characters designate like parts and in which: Fig. l is a view partially in section and partially in elevation of a burner embodying the principles of this invention; and

Fig. 2 a transverse section taken along the line 2-2, Fig. 1.

In the drawing, the numeral l designates a burner housing having a terminal flange 2 abutting against a furnace wall 3 and having an annular housing portion d integrally formed to provide an annular chamber ii with an extension of the housing wall I. The wall l is provided with threaded opening 6 for connection to a threaded conduit or pipe leading to a source of air under pressure. The housing l is further provided with a threaded opening I in the end wall thereof for receiving a flanged screw sleeve 8, the threads of which coact with the thread i of the housing, and the flange of which is provided with a knurled periphery 9to form a grip by which the member 8 is turnable in its threaded mounting. A gas or fuel nozzle It is provided with a threaded surface ii that coacts with threads formed in the screw sleeve 8, the nozzle ill being provided with a constricted end l2, which is screw threaded to receive interchangeable tips l3 and with a threaded opening in for connection with a fuel line.

A pair of partition sleeves Hi and I 5 are disposed within the inner wall I of the burner housing to provide a cylindrical and annular burner passage, the sleeve l5 being secured against movement in the housing l and the sleeve I4 being telescopingly mounted in a recess 16 of sleeve l5. Sleeve M is flared to form a flange or partition I! to which are secured adjusting rods l8 that ex- 50 tend through perforations in screw sleeve 8, the

rods I8 having screw threaded ends for thumb nuts I9 that rest against the outer face of screw sleeve 8. Adjustment of the thumb nuts l9 moves sleeve l4 axially and varies the openings or ports u 20 and 2| constituted by the space between part1;

tion I! of sleeve I 4, the inner face of the screw sleeve 8 and the end face of the downwardly flaring inner wall I of the burner housing. The numerals 22 and 23 designate the inner and outer burner passages, respectively, that terminate in 5 the burner port 24 of the furnace wall 3.

The operation of the above described burner is briefly as follows: The threaded opening 6 .is connected to a source of air under pressure for supporting combustion. The threaded opening Illa of the gas nozzle I0 is connected to a conduit leading to a source of gaseous or liquid fuel. The control of the fuel and air supply is effected by suitable valves in the supply lines or by regulators well-known in the art, and which constitute no part of this invention. It is to be noted that no provision is made for inspirated air as there is no opening on the front side of the burner housing except that of the nozzle Ill connected to the fuel line. Consequently, the total air supply is from air chamber 5 through ports 29 and 2| and by turning thumb nuts l9, the gap or space of the port 2! may be varied to regulate the amount of air that is premixed with the fuel in the passage 22 of the burner. This adjustment will also regulate the size of port 2d through which air passes around the outside of sleeves I l and I5 in the annular chamber 23, the volume of air supplied to the latter chamber controlling the flame characteristios developed within the furnace chamber. 30

The outstanding feature of the hereinbefore described burner is the ability to control the air both simultaneously with the regulation of the air supplied to the inner burner passage or independently thereof. Thus by adjusting thumb nuts 99, both ports 20 and 2| are simultaneously adjusted, the one increasing while the other decreases and vice versa, depending on the direction in which the thumb nuts i 9 are turned. Once the desired premixis obtained in the inner 0 passage 22 by regulation of port 2i, adjustment of the port 20 can be made without disturbing port 25 to passages 22 and 23 by turning the screw sleeve 8, which effects axial movement of the entire assembly of parts, including sleeve I4, in an axial direction to vary the size or degree of opening of the port 20, thereby varying the volume of air in the passage 23 without varying the air within the passage 22.

By means of the foregoing simpleadjustments of the air supply ports; any desirable burner or flame characteristic is obtainable within the limits of fuel and air supply to and within the capacity of the burner.

While I am aware that it has been heretofore proposed to provide burners with controls to vary the so-called primary and secondary air supply, none of these, to my knowledge, provide for both simultaneous and individual adjustment of the air supply passages as herein provided. In terms of burner characteristics, the primary object of regulating the air ports is to obtain a neutral flame condition for efficient burning of the fuel. By adjusting the sleeve 8 to control the air passage 20 leading to the outer burner passage 23, such a neutral combustion can be obtained by supplying just enough air to support combustion in or beyond the outer passage. By then turning the thumb screw members I9, passage 2| may be regulated to obtain desirable flame characteristics. By regulating both passages 20 and 2| in the manner hereinbefore described, neutral, oxidizing or reducing atmospheres may be created in the furnace. Thus, by the simple adjustment herein provided, true proportions of air and fuel for complete combustion are obtainable, as well as insufficient and excess air supply in support of combustion, resulting in reducing or oxidizing atmospheres.

Although one embodiment of the invention has been herein illustrated and described, it will be apparent to those skilled in the art that various modifications may be made in the details of construction without departing from the principles herein set forth.

I claim:

1. A gas burner comprising a cylindrical housing having a threaded opening at one end, and

a screw threaded sleeve in said opening, said dividing the inner chamber into multiple burner passages, a sleeve coacting with the end of the partition and being adjustable for axial movement relative to the partition member, said sleeve having a flanged end disposed in the space between the outer air chamber and the end of the inner housing wall dividing that space into air passages leading into the outer and inner burner passages, the flange of the sleeve being mounted to be movable with the screw threaded sleeve at the end of the burner housing and means for adjusting said flanged sleeve independently of said screw threaded sleeve to vary the gap of said openings.

2. A gas burner comprising a cylindrical housing having a double wall for a portion of its length to form an annular air chamber around an inner chamber, said outer chamber having an inlet connection for a source of air supply, the inner wall of the housing terminating short of the end wall to form a gap between the annular air space and the inner chamber, a cylindrical partition within the inner chamber of the burner dividing the same into a central cylindrical and an outer annular gas and air passage, respectively, a flanged sleeve cooperating with said partition member being slidably mounted for axial movement relative thereto, the flange of the sleeve being disposed in the space between the terminus of the inner burner wall and the end wall of the burner housing dividing said space into ports for the supply of air to the gas and air passages of the burner, a closure at one end of the burner housing, means for adjustably attaching the flanged sleeve to said closure whereby said sleeve may be axially adjusted to vary the degree of opening leading to the gas and air passages of the burner and said closure being adapted for axial movement independently of said sleeve adjusting means to control the volume of air supply to the annular air passage of the burner.

3. A gas burner comprising a cylindrical housing having a double wall for a portion of its length to form an inner and outer chamber, the inner wall of the housing terminating adjacent the end wall thereof to form an air space of substantial proportion, said housing having an air inlet connection for the outer chamber and a screw threaded opening in the end wall adjacent the end of the inner housing wall, a cylindrical partition dividing the inner burner chamber into a cylindrical and annular burner passage, a flange sleeve coacting with the end of said partition to be movable axially thereof, a screw threaded annulus having an outer threaded surface coacting with the threads in the opening of the end wall of the burner housing and having a screw threaded opening for receiving a fuel nozzle adapted for connection to a source of fuel supply, adjustable means accessible on the exterior of the threaded sleeve attached to the flange sleeve of the partition member whereby the latter is axially movable to vary the space on both sides of the flange, thereby controlling the volume of air delivered to the cylindrical and annular burner passages, and said screw threaded sleeve being angularly movable to effect axial movement of the flange partition member, thereby varying the gap leading to the annular burner passage without varying the gap leading from the air chamber to the inner cylindrical burner passage. i

4. A gas burner comprising a cylindrical housing having a double wall for a portion of its length forming an outer air chamber and an inner burner chamber, the inner wall of the housing tapering inward and forming a gap at the end wall of the housing, said housing having an air inlet in its outer wall and an opening in the end wall adjacent the tapered end of the inner wall, a closure for the end wall adapted to be axially movable relative to the end of the tapered wall and having a fuel nozzle mounted therein, a cylindrical partition disposed within the burner chamber dividing said chamber into a cylindrical and annular passage, said partition being recessed at one end, a flanged sleeve having its end portion disposed in the recess of the partition member to be axially movable therein and having its flanged portion disposed in the gap between the end closure of the burner and the tapered end of the burner wall, said sleeve being adjustably mounted on the end closure member to be axially movable relative thereto, and said sleeve being bodily movable upon axial movement of the end closure member.

5. In a gas burner having a central passage surrounded by an annular passage for directing a gaseous fuel and air to a heating chamber, a fuel supply passage communicating at one end with said central burner passage and an air supply passage adjacent the fuel supply passage and communicating with both the inner and outer burner passages, and adjusting means for subdividing the air passage to control the relative volumes of air supplied to the inner and outer burner passages, said means being further adjustable to vary the air supplied to the outer passage of the burner only.

6. In a fuel burner, a tubular air passage and a tubular burner passage concentric with said air passage in spaced relation therewith, a fuel supply passage communicating at one end with said burner passage, an air supply passage communicating at one end with both said air and burner passages, and means disposed in said air supply passage for simultaneously regulating the relative volume of air supplied to said passages.

7. In a fuel burner, a tubular air passage and a tubular burner passage concentric with said air passage in spaced relation therewith, a fuel supply passage communicating at one end with said burner passage, an air supply passage communicating at one end with both said air and burner passages, and a common valve means for regulating the relative volume of air supplied to said passages.

8. In a fuel burner, a tubular air passageand a tubular burner passage concentric with said air passage in spaced relation therewith, a fuel supply passage communicating at one end with said burner passage, an air supply passage communicating at one end with both said air and burner manages, a partition disposed in said air supply passage dividing the air stream to said air and burner passages, and means for adjusting said partition to vary the division of air to the respectlve passages.

passage communicating at one end with said burner passage, an air supply passage communicating at one end with both said air and burner passages, a partition disposed in said air supply passage dividing the air stream to said air and burner passages, and means for adjusting the partition longitudinally of said air and fuel passages to vary the volume of air supply to the respective passages.

10. In a fuel burner, a tubular air passage and a tubular burner passage concentric with said air passage in spaced relation therewith, a fuel supply passage communicating at one end with said burner passage, an air supply passage communicating at one end with both said air and burner passages, a partition disposed in said air supply passage dividing the air stream to said air and burner passages, means for simultaneously varying the volume of air leading to the air and burner passages, and means for independently varying the volume of air supplied to said air passage.

THOMAS E. WOOD.

CAI 

